package lesson16;

public class Demo {

	public static void main(String[] args) 
	{
		Person p = new Person("1234567890", "tralala");
		p.changePassword("tralalal"
				+ "", "nanana");
		p.courseName = "bla";
		System.out.println(Person.courseName);
		Person.courseName = "nana";
	}

}
